骨髓调节干细胞层次和免疫能力
Kazuhiro Furuhashi1,2,3,4, Miwako Kakiuchi1,2, Ryosuke Ueda1,2,5
1Columbia Center for Translational Immunology, Department of Medicine, Columbia University Vagelos College of Physicians and Surgeons, New York, NY, USA.
Nature
|January 1, 2025
概括
新的研究揭示了造血干细胞 (HSC) 及其骨髓的层次结构. 专门的HSCs (NOhi) 具有优越的免疫特权和再生潜力,由独特的血管所调节.
科学领域:
- 血液学
- 免疫学
- 干细胞生物学
背景情况:
- 干细胞存在于特殊的位置,
- 了解干细胞异质性和利基相互作用对于移植和免疫治疗至关重要.
- 干细胞之间存在层次结构及其在免疫耐受性中的作用尚不清楚.
研究的目的:
- 研究血造干细胞 (HSC) 和骨髓内的等级安排.
- 确定这些层次结构是否影响再生潜力和免疫特权.
- 确定干细胞功能和免疫耐受性的特定细分成分.
主要方法:
- 基于氧化 (NO) 生产的不同HSC种群的特征.
- 用特定的血管结构和内皮标志物对HSC同位化的分析.
- 研究内的信号通路,包括状蛋白,CD200,氧化合成酶和自.
主要成果:
- 识别具有高免疫特权和延迟但强大的长期溶解潜力的高水平氧化生成 (NOhi) HSC.
- NOhi HSC与具有初级毛囊内皮和高CD200表达的特殊毛细血管共同定位.
- 这些专门的毛细血管通过IFT20,CD200,内皮氧化合成酶和自来调节NOhi HSC功能和免疫保护.
- 之前描述的利基成分 (状细胞,H型血管) 与免疫特权较低的NOlow HSC相关.
结论:
- 在HSC及其骨髓中存在以前未知的层次结构.
- 专门的血管赋予高免疫特权,并调节原始HSC的再生潜力.
- 利基组织干细胞层次和免疫耐受性,提供免疫治疗的潜在目标.
更多相关视频
相关概念视频
01:26Stem Cell Niche
5.0K
The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
5.0K
01:19Multipotency of Hematopoietic Stem Cells
3.0K
The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
3.0K
01:01Regulation of Hematopoietic Stem Cells
3.1K
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
3.1K
01:06Multipotency and Niche of Bulge Stem Cell
3.4K
A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
3.4K
01:21Lineage Commitment
3.0K
Commitment is the process whereby stem cells:
3.0K
01:21Hematopoiesis
5.1K
The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
5.1K